Googletest export

Remove the dependency on Objective C++ in iOS builds.

252ce9c52d introduced the use of
NSTemporaryDirectory() on iOS, which requires Core Foundation, and
Objective C++.

This CL replaces NSTemporaryDirectory() with an equivalent solution
(according to Apple's documentation at [1]) available to C/C++ code.
Avoiding Objective C++ and Core Foundation makes it easier to integrate
googletest in projects that can't use the supplied Bazel build files.

[1] https://developer.apple.com/library/archive/documentation/Security/Conceptual/SecureCodingGuide/Articles/RaceConditions.html#//apple_ref/doc/uid/TP40002585-SW10

PiperOrigin-RevId: 375474990

BUILD.bazel

@@ -56,12 +56,6 @@ config_setting(
     values = {"define": "absl=1"},
 )
 
-config_setting(
-    name = "ios",
-    values = {"apple_platform_type": "ios"},
-    visibility = [":__subpackages__"],
-)
-
 # Library that defines the FRIEND_TEST macro.
 cc_library(
     name = "gtest_prod",
@@ -92,10 +86,6 @@ cc_library(
         "googlemock/include/gmock/*.h",
     ]),
     copts = select({
-        ":ios": [
-            "-xobjective-c++",
-            "-pthread",
-        ],
         ":windows": [],
         "//conditions:default": ["-pthread"],
     }),